ACPI: video: Use acpi_dev_get_pci_dev() instead of acpi_get_pci_dev()

In acpi_video_bus_check() and find_video(), simply replace
acpi_get_pci_dev() with acpi_dev_get_pci_dev() that can be used
in both places because the ACPI device needed to do the lookup is
available.

In acpi_video_dev_register_backlight(), instead of doing a parent ACPI
handle lookup based on the handle of an ACPI device that is already
available, pass that ACPI device to acpi_dev_parent() which is much
more straightforward and pass the return value of the latter directly
to acpi_dev_get_pci_dev() to get the PCI device associated with it.
That allows local variable acpi_parent to be eliminated.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/2047771.PYKUYFuaPT@rafael.j.wysocki

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